import { describe, it, expect, jest, beforeEach } from "@jest/globals";

// Mock functions for testing with proper typing
const mockApiCall: jest.MockedFunction<(...args: any[]) => any> =
  jest.fn() as jest.MockedFunction<(...args: any[]) => any>;
const mockLogger: {
  info: jest.MockedFunction<any>;
  error: jest.MockedFunction<any>;
  warn: jest.MockedFunction<any>;
  debug: jest.MockedFunction<any>;
} = {
  info: jest.fn(),
  error: jest.fn(),
  warn: jest.fn(),
  debug: jest.fn(),
};

describe("Mock Tests", () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  describe("Mock Function Testing", () => {
    it("should test mock function calls", () => {
      mockApiCall("test-argument");

      expect(mockApiCall).toHaveBeenCalledWith("test-argument");
      expect(mockApiCall).toHaveBeenCalledTimes(1);
    });

    it("should test mock return values", () => {
      mockApiCall.mockReturnValue({ success: true, data: "test" });

      const result: { success: boolean; data: string } = mockApiCall() as {
        success: boolean;
        data: string;
      };

      expect(result.success).toBe(true);
      expect(result.data).toBe("test");
    });

    it("should test mock resolved values", async () => {
      mockApiCall.mockResolvedValue({ id: "123", name: "Test" });

      const result: { id: string; name: string } = (await mockApiCall()) as {
        id: string;
        name: string;
      };

      expect(result.id).toBe("123");
      expect(result.name).toBe("Test");
    });

    it("should test mock rejected values", async () => {
      mockApiCall.mockRejectedValue(new Error("API Error"));

      await expect(mockApiCall()).rejects.toThrow("API Error");
    });
  });

  describe("Logger Mock Testing", () => {
    it("should test logger calls", () => {
      mockLogger.info("Test info message");
      mockLogger.error("Test error message");

      expect(mockLogger.info).toHaveBeenCalledWith("Test info message");
      expect(mockLogger.error).toHaveBeenCalledWith("Test error message");
    });

    it("should test logger call counts", () => {
      mockLogger.info("Message 1");
      mockLogger.info("Message 2");
      mockLogger.info("Message 3");

      expect(mockLogger.info).toHaveBeenCalledTimes(3);
    });

    it("should test logger with different log levels", () => {
      mockLogger.debug("Debug message");
      mockLogger.info("Info message");
      mockLogger.warn("Warning message");
      mockLogger.error("Error message");

      expect(mockLogger.debug).toHaveBeenCalledWith("Debug message");
      expect(mockLogger.info).toHaveBeenCalledWith("Info message");
      expect(mockLogger.warn).toHaveBeenCalledWith("Warning message");
      expect(mockLogger.error).toHaveBeenCalledWith("Error message");
    });
  });

  describe("Complex Mock Scenarios", () => {
    it("should test conditional mock behavior", () => {
      mockApiCall.mockImplementation((arg: unknown) => {
        if (arg === "success") {
          return { status: "ok", data: "success data" };
        } else if (arg === "error") {
          throw new Error("Mock error");
        } else {
          return { status: "unknown", data: null };
        }
      });

      expect(mockApiCall("success")).toEqual({
        status: "ok",
        data: "success data",
      });

      expect(() => {
        return mockApiCall("error");
      }).toThrow("Mock error");

      expect(mockApiCall("other")).toEqual({
        status: "unknown",
        data: null,
      });
    });

    it("should test async mock implementation", async () => {
      mockApiCall.mockImplementation(async (id: unknown) => {
        await new Promise((resolve: (value?: unknown) => void) => {
          setTimeout(resolve, 10);
        });
        return { id, processed: true };
      });

      const result: { id: string; processed: boolean } = (await mockApiCall(
        "test-id",
      )) as {
        id: string;
        processed: boolean;
      };

      expect(result.id).toBe("test-id");
      expect(result.processed).toBe(true);
    });

    it("should test mock function chaining", () => {
      mockApiCall
        .mockReturnValueOnce({ attempt: 1 })
        .mockReturnValueOnce({ attempt: 2 })
        .mockReturnValue({ attempt: "default" });

      expect(mockApiCall()).toEqual({ attempt: 1 });
      expect(mockApiCall()).toEqual({ attempt: 2 });
      expect(mockApiCall()).toEqual({ attempt: "default" });
      expect(mockApiCall()).toEqual({ attempt: "default" });
    });
  });

  describe("Error Handling Tests", () => {
    it("should handle synchronous errors", () => {
      mockApiCall.mockImplementation(() => {
        throw new Error("Sync error");
      });

      expect(() => {
        return mockApiCall();
      }).toThrow("Sync error");
    });

    it("should handle asynchronous errors", async () => {
      mockApiCall.mockRejectedValue(new Error("Async error"));

      await expect(mockApiCall()).rejects.toThrow("Async error");
    });

    it("should handle different error types", async () => {
      const customError: { code: string; message: string } = {
        code: "CUSTOM_ERROR",
        message: "Custom error message",
      };

      mockApiCall.mockRejectedValue(customError);

      try {
        await mockApiCall();
      } catch (error) {
        expect(error).toEqual(customError);
      }
    });
  });

  describe("Validation Tests", () => {
    it("should validate input parameters", () => {
      mockApiCall.mockImplementation((input: any) => {
        if (!input || typeof input !== "object") {
          throw new Error("Invalid input");
        }
        if (!input.id) {
          throw new Error("ID is required");
        }
        return { success: true, id: input.id };
      });

      expect(() => {
        return mockApiCall(null);
      }).toThrow("Invalid input");
      expect(() => {
        return mockApiCall("string");
      }).toThrow("Invalid input");
      expect(() => {
        return mockApiCall({});
      }).toThrow("ID is required");
      expect(mockApiCall({ id: "123" })).toEqual({
        success: true,
        id: "123",
      });
    });

    it("should validate response format", () => {
      const validResponse: {
        success: boolean;
        data: { id: string; name: string };
        timestamp: string;
      } = {
        success: true,
        data: { id: "123", name: "Test" },
        timestamp: new Date().toISOString(),
      };

      mockApiCall.mockReturnValue(validResponse);
      const result: {
        success: boolean;
        data: Record<string, unknown>;
        timestamp: string;
      } = mockApiCall() as {
        success: boolean;
        data: Record<string, unknown>;
        timestamp: string;
      };

      expect(result).toHaveProperty("success");
      expect(result).toHaveProperty("data");
      expect(result).toHaveProperty("timestamp");
      expect(typeof result.success).toBe("boolean");
      expect(typeof result.data).toBe("object");
      expect(typeof result.timestamp).toBe("string");
    });
  });
});
